Lawmakers are working against an Oct. 17 deadline for raising the nation's borrowing limit. 

Treasury and the White House have warned that if the limit is not lifted, the government could default on its debt, leading to a recession. 

Mikulski, the Senate Appropriations Committee Chairwoman, urged her colleagues to support a measure from Senate Majority Leader Harry ReidHarry Mason ReidDems search for winning playbook Dems face hard choice for State of the Union response The Memo: Immigration battle tests activists’ muscle MORE (D-Nev.) that would raise the debt ceiling by nearly $1 trillion. A procedural vote to advance that legislation is scheduled for Saturday.

It's unclear whether Reid will have the votes. The measure would raise the debt ceiling but would not cut spending, and it could be difficult for Republicans to back a "clean" debt ceiling hike.

"If we as a nation are going to incur more debt, then we need to find real savings," Sen. John BarrassoJohn Anthony BarrassoTrump’s infrastructure plan may slip to next month Overnight Finance: Trump, lawmakers take key step to immigration deal | Trump urges Congress to bring back earmarks | Tax law poised to create windfall for states | Trump to attend Davos | Dimon walks back bitcoin criticism Trump's infrastructure team to huddle with senators MORE (R-Wyo.) said Thursday. "It’s time to set [spending] priorities."

The House is expected to pass its own short-term debt-ceiling extension, possibly later this week, but many Republicans are trying to add language that would cut entitlement programs, including ObamaCare.